I've used https://www.inlinetube.com/ for fuel lines, but brakes are kinda their specialty. They have an online catalog, but probably quicker to give them a call as they have lots of applications that aren't listed. Lines are typically sold as a set - "front lines", "rear lines", etc. Give them all the information you can about your truck up front. I ordered the Blazer lines for my 2000 Blazer and ended up with 4 door parts instead of the 2 door I needed. They went out of their way to make things right, but doesn't hurt to make sure up front.
If you're local to Metro Detroit the lines can be picked up at their place of business, but they're supposedly pretty good at shipping too.